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cf4057be01
This is to avoid name conflicts once we move all classes from namespace `type` to `sem`. Bug: tint:724 Change-Id: Icc3d81ae62eb3b329ce28e78a23ea27f29c9263b Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/48360 Commit-Queue: Antonio Maiorano <amaiorano@google.com> Reviewed-by: Ben Clayton <bclayton@google.com>
106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
// Copyright 2020 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "src/transform/bound_array_accessors.h"
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#include <algorithm>
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#include <utility>
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#include "src/program_builder.h"
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#include "src/sem/expression.h"
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namespace tint {
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namespace transform {
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BoundArrayAccessors::BoundArrayAccessors() = default;
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BoundArrayAccessors::~BoundArrayAccessors() = default;
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Output BoundArrayAccessors::Run(const Program* in, const DataMap&) {
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ProgramBuilder out;
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CloneContext ctx(&out, in);
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ctx.ReplaceAll([&](ast::ArrayAccessorExpression* expr) {
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return Transform(expr, &ctx);
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});
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ctx.Clone();
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return Output(Program(std::move(out)));
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}
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ast::ArrayAccessorExpression* BoundArrayAccessors::Transform(
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ast::ArrayAccessorExpression* expr,
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CloneContext* ctx) {
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auto& diags = ctx->dst->Diagnostics();
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auto* ret_type = ctx->src->Sem().Get(expr->array())->Type()->UnwrapAll();
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if (!ret_type->Is<type::ArrayType>() && !ret_type->Is<type::Matrix>() &&
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!ret_type->Is<type::Vector>()) {
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return nullptr;
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}
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ProgramBuilder& b = *ctx->dst;
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using u32 = ProgramBuilder::u32;
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uint32_t size = 0;
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bool is_vec = ret_type->Is<type::Vector>();
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bool is_arr = ret_type->Is<type::ArrayType>();
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if (is_vec || is_arr) {
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size = is_vec ? ret_type->As<type::Vector>()->size()
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: ret_type->As<type::ArrayType>()->size();
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} else {
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// The row accessor would have been an embedded array accessor and already
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// handled, so we just need to do columns here.
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size = ret_type->As<type::Matrix>()->columns();
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}
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auto* const old_idx = expr->idx_expr();
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b.SetSource(ctx->Clone(old_idx->source()));
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ast::Expression* new_idx = nullptr;
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if (size == 0) {
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if (is_arr) {
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auto* arr = ctx->Clone(expr->array());
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auto* arr_len = b.Call("arrayLength", arr);
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auto* limit = b.Sub(arr_len, b.Expr(1u));
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new_idx = b.Call("min", b.Construct<u32>(ctx->Clone(old_idx)), limit);
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} else {
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diags.add_error("invalid 0 size", expr->source());
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return nullptr;
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}
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} else if (auto* c = old_idx->As<ast::ScalarConstructorExpression>()) {
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// Scalar constructor we can re-write the value to be within bounds.
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auto* lit = c->literal();
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if (auto* sint = lit->As<ast::SintLiteral>()) {
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int32_t max = static_cast<int32_t>(size) - 1;
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new_idx = b.Expr(std::max(std::min(sint->value(), max), 0));
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} else if (auto* uint = lit->As<ast::UintLiteral>()) {
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new_idx = b.Expr(std::min(uint->value(), size - 1));
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} else {
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diags.add_error("unknown scalar constructor type for accessor",
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expr->source());
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return nullptr;
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}
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} else {
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auto* cloned_idx = ctx->Clone(old_idx);
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new_idx = b.Call("min", b.Construct<u32>(cloned_idx), b.Expr(size - 1));
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}
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// Clone arguments outside of create() call to have deterministic ordering
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auto src = ctx->Clone(expr->source());
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auto* arr = ctx->Clone(expr->array());
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return b.create<ast::ArrayAccessorExpression>(src, arr, new_idx);
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}
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} // namespace transform
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} // namespace tint
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